Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of swirl flow meter in China. Welcome to buy high quality swirl flow meter at competitive price from our factory. We also accept customized orders.
Core Specifications
High Accuracy Gas Measurement
Accuracy up to ±1.0% of reading
Wide Flow Range
Flow range: 1 ~ 3600 m³/h
Integrated Compensation
Built-in temperature and pressure sensors
Multiple Communication Outputs
4-20mA
Pulse Output
RS485 Modbus RTU
Industrial-Grade Construction
Pipe size: DN15 ~ DN200
Please see the Specifications for more details.
Wide Range Performance
Adapts to Changing Gas Demand
Gas consumption rarely remains constant. The HNF70 maintains stable measurement performance across varying operating conditions, from low-load standby operation to peak production demand.
With a wide turndown ratio and excellent linearity, the meter helps reduce sizing concerns and improves measurement reliability throughout the entire flow range.
Key Benefits
✓ Stable low-flow detection
✓ Suitable for fluctuating gas consumption
✓ Wide measuring range up to 3600 m³/h
✓ Reduced risk of oversizing or undersizing
Product Features
Built for Industrial Reliability
The HNF70 combines dual-sensor detection technology with advanced signal processing algorithms to maintain measurement stability in demanding environments.
Designed for continuous operation, it performs reliably even in systems affected by pipeline vibration, pressure fluctuations, or equipment-induced disturbances.
Key Benefits
✓ Anti-vibration signal processing
✓ Dual detection technology
✓ Low maintenance requirements
✓ Reliable long-term operation
How Vortex Precession Works
Accurate Measurement Through Vortex Precession
As gas passes through the spiral guide vane, a stable rotating vortex is generated inside the flowmeter body.
The vortex undergoes secondary rotation within the expansion section, creating a precession frequency directly proportional to the gas flow rate. This frequency is detected and converted into a flow signal for accurate measurement.
Because the measurement principle relies on vortex frequency rather than mechanical movement, the system delivers stable performance with minimal wear.
Key Benefits
✓ No moving measuring components
✓ Stable signal generation
✓ Excellent repeatability
✓ Suitable for continuous gas monitoring
Applications
Accurate Measurement Across Variable Flow Conditions
Designed for applications where gas demand changes throughout the day. The HNF70 delivers stable and reliable flow measurement from startup to full-load operation.
Applications
• Natural Gas Systems
• Boiler Fuel Gas
• Process Gas Monitoring
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HNF70 Swirl Vortex Flow Meter |
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Specific Parameters |
Value / Description |
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Measurement Principle |
The vortex flow meter works based on the principle of precession. When gas flows through the vortex generator at the inlet of the flow meter, it is forced to rotate and form a vortex flow. This vortex flow accelerates in the Venturi tube-shaped measurement tube, with the vortex core (precession) precessing along the pipeline axis. The precession frequency is proportional to the volumetric flow rate of the fluid under working conditions. The built-in sensor detects this frequency signal, and integrated pressure and temperature sensors perform real-time compensation. The microprocessor directly calculates and outputs multi-parameter data such as standard volume flow rate and total volume. |
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Nominal Diameter Range |
DN15 ~ DN200 |
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Wetted Parts Material |
Housing Material: Aluminum Alloy/304 Stainless Steel; Moving Parts Material: Aluminum Alloy/304 Stainless Steel |
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Connection Method |
Flange Connection |
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Maximum Measurement Error |
±1.0%R (Typical), ±0.5%R (High Precision) |
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Measurement Range |
DN15: 1-10 m³/h to DN200: 240~3000 m³/h |
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Maximum Process Pressure |
DN15-DN50: 4.0 MPa; DN65-DN200: 1.6 MPa (pressure values above can be supplied upon agreement) |
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Medium Temperature Range |
-20 °C ~ +120 °C |
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Ambient Temperature Range |
-20 °C ~ 65 °C |
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Transmitter Housing Material |
Aluminum Alloy or 304 Stainless Steel (Depending on the model, optional) |
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Display/Operation |
Features a Chinese character dot matrix display, capable of displaying parameters such as working volume flow rate, standard volume flow rate, total volume, medium pressure, temperature, etc. |
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Inputs |
Analog Input, Digital Input (Pulse) |
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Outputs |
Pulse output; 4-20mA current; RS485 (Modbus RTU protocol); HART protocol; IoT GPRS, etc. |
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Power Supply |
+6-24VDC (current ≤10mA); Battery powered: 3.6V lithium battery |
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Certificate |
Explosion-proof rating: Ex PCT6Gb; Protection rating: IP65 |
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Functional Safety |
SIL |
